Jellyfin 😎
I used to use Google Play Music for years but when they shut down YouTube Music has always been garbage by comparison. I just pirate the music I like and donate occasionally to artists I like.
GPM was utter perfection. It recommended such perfect suggestions and the mixing was like God himself was DJing from heaven. YouTube Music is still what I use but I dislike it.
It was super smart with offline streaming too, queuing up the smart downloads when you had no connection and requeuing your original mix when the connection returns. I relied on that for road trips and nothing comes close in functionality.